8 3/4 Limit?

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  1. Hemi31

    Hemi31 Well-Known Member

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    I have a 66 Charger with a Gen3 Hemi,727 with A&A valvebody and brake. Makes around 500
    /450 to the tire and plan on a 200 shot of nitrous. The rear is the factory 8 3/4 housing, 489 case,3.23 gear and moser axles. Before go and spend $2800 on a Dana60 will the 8 3/4 survive or am I right in thinking it will be scrap in a hurry?
     
  2. zyzzyx

    zyzzyx FBBO Gold Member FBBO Gold Member

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    The ring gear will deflect and you will transform it into scrap metal fast.
    why would you want to put that much HP and torque into a 3:23 gear?
    The Dana is heavier, but will take the punishment.
     
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    • Hemi31

      Hemi31 Well-Known Member

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      i didnt, just verifying before I destroy my current budget. Just keep it off the track till I can afford a 60
       
    • zyzzyx

      zyzzyx FBBO Gold Member FBBO Gold Member

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      The 8-3/4 is worth something now. If you destroy it, it will be worthless.
      the extra cash will help you offset the cost of the Dana.
       
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      • Hemi31

        Hemi31 Well-Known Member

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        yup,thats why i asked
         
      • zyzzyx

        zyzzyx FBBO Gold Member FBBO Gold Member

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        A 66 Charger would be nice with a 3:73.
         
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        • 1967coronet440

          1967coronet440 FBBO Gold Member FBBO Gold Member

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          I went to build my 8 3/4 to handle the power of my new stroker motor when I called dr diff about parts he asked about power I told him then I bought a s60 lol. No way it’ll last with sticky tires and some traction.

          B4752C5A-A739-4CDA-8130-5939BEA3D6FD.jpeg
           
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          • gtxracer

            gtxracer FBBO Gold Member FBBO Gold Member

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            Maybe I am lucky, but I have probably made a few thousand passes since '72 and I still use the original housing that came in my GTX. I've changed the third member a couple times, for gear upgrades with a best of 10.34 and 60ft at 1.43.
            Bob :moparsmiley:
             
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            • Cranky

              Cranky Moderator Staff Member FBBO Gold Member

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              I would say you're blessed! Just out of curiosity, what does your car weigh?
               
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              • dvw

                dvw FBBO Gold Member FBBO Gold Member

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                On the street they'll go forever. At the track 11.0@3800 will usually survive quite awhile with an auto trans.
                Doug
                 
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                • Hemi31

                  Hemi31 Well-Known Member

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                  when I change it the gear will be 4.10
                   
                • gtxracer

                  gtxracer FBBO Gold Member FBBO Gold Member

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                  Cranky, Thanks for asking and the last time it was weighed. #3460
                   
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                  • Cranky

                    Cranky Moderator Staff Member FBBO Gold Member

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                    A buddy and I ran a car that was lighter but we were running a 4 speed in it. Low 11's was the braking point but it was being launched at 6k. After going through several gear sets, in went a 60 and the breaking of gears stopped. The car was right around 3200 iirc at that point....
                     
                  • Mike Gaines

                    Mike Gaines FBBO Gold Member FBBO Gold Member

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                    Sell the 8 3/4 before you break it and buy a DANA. You will never look back.
                     
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                    • dvw

                      dvw FBBO Gold Member FBBO Gold Member

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                      I've broke 2 sets of Dana gears in mine. 3340 lbs foot brake, 1.2x 60 ft. The 1st set was a Motive street gear. Went about 425 passes, then bent the teeth. Second set was a off brand cheapy. went 125 passes and broke 2 pinion teeth. This time it's getting a US Gear Pro gear set. My street car runs 11.0@3875lbs It has had the same 8 3/4 for years. Though probably less than 200 strip passes.
                      Doug
                       
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                      • 5.7 hemi

                        5.7 hemi Well-Known Member

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                        Dana and your set.
                         
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                        • 383man

                          383man Well-Known Member

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                          My 63 is also a street car that still has an 8-3/4 in it. The 8-3/4 has been in it with me driving it on the street since 2006 behind my 500 hp 440 and since 2011 behind my 600 hp (or around that) 493. But I only race about once a year and usually only put from 3 to 6 passes on it. I don't run it hard or race it on the street. I just went racing 2 weeks ago and put three passes on it. Usually runs 10.80's with 10.70's best. If I had the money it would already have a Dana in it. I feel lucky its been holding up fine but every time I go racing I worry about it. Ron
                           
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                          • Preachr

                            Preachr FBBO Gold Member FBBO Gold Member

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                            Good info 383. Nice to hear everyones opinion.
                             
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                            • Cranky

                              Cranky Moderator Staff Member FBBO Gold Member

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                              We used the Pro gears too and I'm thinking 425 passes with the Motives is pretty good.

                              To me, peace of mind is worth the extry $$$. It doesn't happen too often but a rear can grenade and lock up if it does lock up, you're just along for the ride.....and those walls ain't cheap.
                               
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                              • Dodge 330

                                Dodge 330 Well-Known Member

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                                You don't need to spend $2800 on a Dana!

                                I cut the full floating ends off a truck axle, had 8 3/4 ends welded on and installed Dr. Diff axles and a spool with the stock 3.54 gear.

                                I have well under $1k in mine.
                                 
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